Quickly detachable scraper blades



Nov. 11, 1969 J. J. GRAY 3,477,520

QUICKLY 'DETACHABLE SCRAPER BLADES Filed Jan. 16, 1968 20 2| l7 I8 32 l8I7 23 2| 2O .9 W i1 ATTORNEY United States Patent 3,477,520 QUICKLYDETACHABLE SCRAPER BLADES James J. Gray, 217 Winder-mere Road, Calgary,Alberta, Canada Filed Jan. 16, 1968, Ser. No. 698,324 Int. Cl. A01b35/32, 39/22, 35/20 US. Cl. 172-719 1 Claim ABSTRACT OF THE DISCLOSUREThis invention relates to new and useful improvements in quicklydetachable blades for scrapers or the like and although the invention isdescribed with relation to road scrapers, nevertheless it will beappreciated that it can be applied to any form of scraper bladeattachable to a back plate or mould board.

The conventional method of attaching such blades to mould boards consistof a plurality of nuts and bolts extending through the blade and mouldboard.

These are expensive to replace inasmuch as whenever the blades arechanged, new bolts are required due to corrosion and wear.

It is also difficult to hold the new blades in place against the mouldboard while the bolts are being inserted and in fact, considerabledanger exists if this operation is attempted by one individual.

The present invention overcomes these disadvantages by providing aplurality of wedge blocks secured to the back of the blade which engagewithin apertures in the mould board. Means are provided to move theblade edgewise of the mould board thus tightening the wedge blocks intowedging engagement with edges of the apertures.

A further object of the invention is to provide a device of thecharacter herewithin described in which the blade can be mounted on themould board readily and easily and then tightened into position by meansof an eye bolt situated behind the mould board and thereby protectedfrom damage.

A yet further object of the invention is to provide a device of thecharacter herewithin described which is simple in construction,economical in manufacture, and otherwise well suited to the purpose forwhich it is designed.

With the foregoing considerations in view, and such other objects,purposes or advantages as may become apparent from consideration of thisdisclosure and specification, the present invention consists of theinventive concept exhibited in the method, process, construction,arrangement of parts, or new use of any of the foregoing hereinparticularly exemplified in one or more specific embodiments of suchconcept, reference being had to the accompanying figures in which-FIGURE 1 is a rear view of a mould board with the blades attachedthereto.

FIGURE 2 is a fragmentary isometric view of one end portion of one ofthe blades.

FIGURE 3 is a side elevation of a portion of one of the blades.

FIGURE 4 is an enlarged fragmentary elevational view showing the eyebolt connection.

FIGURE 5 is an end view of FIGURE 1.

FIGURE 6 is an enlarged fragmentary side elevation sectioned in part toshow the engagement of the blade with the mould board. t

In the drawings like characters of reference indicate correspondingparts in the different figures.

Proceeding therefore to describe the invention in detail, referencecharacter 10 illustrates the substantially arcuately curved rectangularconfiguration mould board secured to the implement by means of supportarms 11 in the usual way.

It is usual to provide a pair of blades 12 and 13 although, in someinstances, a single blade can be utilized.

Each blade consists of the substantially arcuately curved planar element14 usually edge sharpened on one edge 15. Secured as by welding or thelike to the back surface 16 of the blade, is a plurality of wedge blocks17 and these wedge blocks are provided with an inclined face or cam edge18 extending inwardly and rearwardly from the end 19 of the blade andfrom the rear surface 16.

In the present embodiment, there are four such wedge blocks 17 as shownin FIGURE 1 and I also provide a hook block 20 at said outer edge 19.This hook block is also secured to the rear surface 16 as by welding andincludes an upwardly and inwardly inclined face 21 which is adapted toengage over the outer end 22 of the mould board 10 when the blade isengaged with the front surface 10' of the mould board. A plurality ofsubstantially rectangular apertures 23 are formed through the mouldboard and receive the wedge blocks 17 when the blade is in position. Theinclined surfaces 18 engage the inner edges 24 forming the boundary ofthe apertures 23 as illustrated in FIGURE 6.

Means are provided to move the blades endwise in the direction of arrows25 or towards the center of the mould board, said means taking the formof eye bolt assemblies 26. An angulated bracket 27 is secured to therear surface of the mould board and is provided with an offstandingflange 28 which is apertured to receive the screw threaded end 29 of theeye bolt which can be tightened by means of nut 30.

The eye 31 of the eye bolt engages around a hooked element 32 alsosecured to the rear of the blade 16 and extending through one of theapertures in the mould board specifically designated 23A. By tighteningthe eye bolt assembly, the blade is moved endwise in the direction ofarrow 25 thus causing the wedge blocks 17 to come into wedgingengagement with the edges 24 of the apertures and this action togetherwith the engagement of the hook element 20 with the end of the mouldboard, clamps the blade firmly in position upon the mould board.

Removal is simple and entails merely loosening the eye bolt until thehook 32 can be disengaged from the eye 31 whereupon the blade can beknocked in a direction opposite to arrow 25 so that it can be detached.

Apart from the improvement in holding the blade to the mould board, afurther improvement is found in the strength of the blade. Usually aplurality of relatively large bolt holes are formed through the bladewhich weakens same considerably. These are, of course, eliminated in thepresent construction thus strengthening the blade.

What is claimed to be the present invention is:

The combination of a horizontally elongated mould board having a frontand back and provided with a horizontal row of rectangular apertures, ahorizontally elongated scraper blade superposed on the front of saidmould board, a plurality of Wedge blocks secured to said blade andprojecting rearwardly through said apertures to the back of the mouldboard, said blocks having cam edges which extend.;obliquely rearwardlyfrom said blade in the same horizontal direction and are wedginglyengageable with edges of said apertures in the mould board, and meansfor moving said blade in said horizontal direction relative to the mouldboard whereby to lock said blocks in said apertures and hold the mouldboard and blade assembled, said means comprising a hook provided on saidblade and projecting through one of said apertures to the back of themould board, a bracket provided on the back of the mould board at apoint offset horizontally from said hook, and an eye bolt having its eyein engagement with said hook and also having a nut-equipped screw- 4"threaded shank portion extending through and, adjustable in an apertureprovided in said bracket.

References Cited UNITED STATES PATENTS 1,009,662 11/1911 Goyeneche172-751 XR 1,095,404 5/1914 Koepke 172-719 1,189,587 7/1916 Lamb 172-7531,345,209 6/1920 Martin 172753 XR 1,358,584 11/1920 Schenk 172-7531,362,137 12/1920 Porter 172-751 2,189,745 2/1940 Johnson 172-7193,202,226 I 8/1965 Carson 1727l9 EDGAR S. BURR, Primary Examiner US. Cl.X.R.

